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We report on the electronic band structure, structural, magnetic and thermalproperties of Ce$_2$Rh$_3$Sn$_5$. Ce $L_{\mathrm{III}}$-edge XAS spectra givedirect evidence for an intermediate valence behaviour. Thermodynamicmeasurements reveal magnetic transitions at $T_{\mathrm{N1}}\approx$ 2.9 K and$T_{\mathrm{N2}}\approx$ 2.4 K. Electrical resistivity shows behaviour typicalfor Kondo lattices. The coexistence of magnetic order and valence fluctuationsin a Kondo lattice system we attribute to a peculiar crystal structure in whichCe ions occupy two distinct lattice sites. Analysis of the structural featuresof Ce$_2$Rh$_3$Sn$_5$, together with results of electronic band structurecalculations and thermodynamic data indicate that Ce2 ions are in anintermediate valence state with the ground state electronic configuration closeto 4$f^0$, whereas Ce1 ions are trivalent (4$f^1$) and contribute to the lowtemperature magnetic ordering. Thus, our joined experimental and theoreticalinvestigations classify Ce$_2$Rh$_3$Sn$_5$ as a multivalent charge-orderedsystem.

Coexistence of magnetic order and valence fluctuations in the Kondo lattice system Ce$_2$Rh$_3$Sn$_5$